writebsp.c

/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.

This file is part of Quake III Arena source code.

Quake III Arena source code is free software; you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.

Quake III Arena source code is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Foobar; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
===========================================================================
*/
#include "qbsp.h"

int		c_nofaces;
int		c_facenodes;


/*
=========================================================

ONLY SAVE OUT PLANES THAT ARE ACTUALLY USED AS NODES

=========================================================
*/

int		planeused[MAX_MAP_PLANES];

/*
============
EmitPlanes

There is no oportunity to discard planes, because all of the original
brushes will be saved in the map.
============
*/
void EmitPlanes (void)
{
	int			i;
	dplane_t	*dp;
	plane_t		*mp;
	//ME: this causes a crash??
//	int		planetranslate[MAX_MAP_PLANES];

	mp = mapplanes;
	for (i=0 ; i<nummapplanes ; i++, mp++)
	{
		dp = &dplanes[numplanes];
//		planetranslate[i] = numplanes;
		VectorCopy ( mp->normal, dp->normal);
		dp->dist = mp->dist;
		dp->type = mp->type;
		numplanes++;
		if (numplanes >= MAX_MAP_PLANES)
			Error("MAX_MAP_PLANES");
	}
}


//========================================================

void EmitMarkFace (dleaf_t *leaf_p, face_t *f)
{
	int			i;
	int			facenum;

	while (f->merged)
		f = f->merged;

	if (f->split[0])
	{
		EmitMarkFace (leaf_p, f->split[0]);
		EmitMarkFace (leaf_p, f->split[1]);
		return;
	}

	facenum = f->outputnumber;
	if (facenum == -1)
		return;	// degenerate face

	if (facenum < 0 || facenum >= numfaces)
		Error ("Bad leafface");
	for (i=leaf_p->firstleafface ; i<numleaffaces ; i++)
		if (dleaffaces[i] == facenum)
			break;		// merged out face
	if (i == numleaffaces)
	{
		if (numleaffaces >= MAX_MAP_LEAFFACES)
			Error ("MAX_MAP_LEAFFACES");

		dleaffaces[numleaffaces] =  facenum;
		numleaffaces++;
	}

}


/*
==================
EmitLeaf
==================
*/
void EmitLeaf (node_t *node)
{
	dleaf_t		*leaf_p;
	portal_t	*p;
	int			s;
	face_t		*f;
	bspbrush_t	*b;
	int			i;
	int			brushnum;

	// emit a leaf
	if (numleafs >= MAX_MAP_LEAFS)
		Error ("MAX_MAP_LEAFS");

	leaf_p = &dleafs[numleafs];
	numleafs++;

	leaf_p->contents = node->contents;
	leaf_p->cluster = node->cluster;
	leaf_p->area = node->area;

	//
	// write bounding box info
	//	
	VectorCopy (node->mins, leaf_p->mins);
	VectorCopy (node->maxs, leaf_p->maxs);
	
	//
	// write the leafbrushes
	//
	leaf_p->firstleafbrush = numleafbrushes;
	for (b=node->brushlist ; b ; b=b->next)
	{
		if (numleafbrushes >= MAX_MAP_LEAFBRUSHES)
			Error ("MAX_MAP_LEAFBRUSHES");

		brushnum = b->original - mapbrushes;
		for (i=leaf_p->firstleafbrush ; i<numleafbrushes ; i++)
			if (dleafbrushes[i] == brushnum)
				break;
		if (i == numleafbrushes)
		{
			dleafbrushes[numleafbrushes] = brushnum;
			numleafbrushes++;
		}
	}
	leaf_p->numleafbrushes = numleafbrushes - leaf_p->firstleafbrush;

	//
	// write the leaffaces
	//
	if (leaf_p->contents & CONTENTS_SOLID)
		return;		// no leaffaces in solids

	leaf_p->firstleafface = numleaffaces;

	for (p = node->portals ; p ; p = p->next[s])	
	{
		s = (p->nodes[1] == node);
		f = p->face[s];
		if (!f)
			continue;	// not a visible portal

		EmitMarkFace (leaf_p, f);
	}
	
	leaf_p->numleaffaces = numleaffaces - leaf_p->firstleafface;
}


/*
==================
EmitFace
==================
*/
void EmitFace (face_t *f)
{
	dface_t	*df;
	int		i;
	int		e;

	f->outputnumber = -1;

	if (f->numpoints < 3)
	{
		return;		// degenerated
	}
	if (f->merged || f->split[0] || f->split[1])
	{
		return;		// not a final face
	}

	// save output number so leaffaces can use
	f->outputnumber = numfaces;

	if (numfaces >= MAX_MAP_FACES)
		Error ("numfaces == MAX_MAP_FACES");
	df = &dfaces[numfaces];
	numfaces++;

	// planenum is used by qlight, but not quake
	df->planenum = f->planenum & (~1);
	df->side = f->planenum & 1;

	df->firstedge = numsurfedges;
	df->numedges = f->numpoints;
	df->texinfo = f->texinfo;
	for (i=0 ; i<f->numpoints ; i++)
	{
//		e = GetEdge (f->pts[i], f->pts[(i+1)%f->numpoints], f);
		e = GetEdge2 (f->vertexnums[i], f->vertexnums[(i+1)%f->numpoints], f);
		if (numsurfedges >= MAX_MAP_SURFEDGES)
			Error ("numsurfedges == MAX_MAP_SURFEDGES");
		dsurfedges[numsurfedges] = e;
		numsurfedges++;
	}
}

/*
============
EmitDrawingNode_r
============
*/
int EmitDrawNode_r (node_t *node)
{
	dnode_t	*n;
	face_t	*f;
	int		i;

	if (node->planenum == PLANENUM_LEAF)
	{
		EmitLeaf (node);
		return -numleafs;
	}

	// emit a node	
	if (numnodes == MAX_MAP_NODES)
		Error ("MAX_MAP_NODES");
	n = &dnodes[numnodes];
	numnodes++;

	VectorCopy (node->mins, n->mins);
	VectorCopy (node->maxs, n->maxs);

	planeused[node->planenum]++;
	planeused[node->planenum^1]++;

	if (node->planenum & 1)
		Error ("WriteDrawNodes_r: odd planenum");
	n->planenum = node->planenum;
	n->firstface = numfaces;

	if (!node->faces)
		c_nofaces++;
	else
		c_facenodes++;

	for (f=node->faces ; f ; f=f->next)
		EmitFace (f);

	n->numfaces = numfaces - n->firstface;


	//
	// recursively output the other nodes
	//	
	for (i=0 ; i<2 ; i++)
	{
		if (node->children[i]->planenum == PLANENUM_LEAF)
		{
			n->children[i] = -(numleafs + 1);
			EmitLeaf (node->children[i]);
		}
		else
		{
			n->children[i] = numnodes;	
			EmitDrawNode_r (node->children[i]);
		}
	}

	return n - dnodes;
}

//=========================================================


/*
============
WriteBSP
============
*/
void WriteBSP (node_t *headnode)
{
	int		oldfaces;

	c_nofaces = 0;
	c_facenodes = 0;

	qprintf ("--- WriteBSP ---\n");

	oldfaces = numfaces;
	dmodels[nummodels].headnode = EmitDrawNode_r (headnode);
	EmitAreaPortals (headnode);

	qprintf ("%5i nodes with faces\n", c_facenodes);
	qprintf ("%5i nodes without faces\n", c_nofaces);
	qprintf ("%5i faces\n", numfaces-oldfaces);
}

//===========================================================

/*
============
SetModelNumbers
============
*/
void SetModelNumbers (void)
{
	int		i;
	int		models;
	char	value[10];

	models = 1;
	for (i=1 ; i<num_entities ; i++)
	{
		if (entities[i].numbrushes)
		{
			sprintf (value, "*%i", models);
			models++;
			SetKeyValue (&entities[i], "model", value);
		}
	}

}

/*
============
SetLightStyles
============
*/
#define	MAX_SWITCHED_LIGHTS	32
void SetLightStyles (void)
{
	int		stylenum;
	char	*t;
	entity_t	*e;
	int		i, j;
	char	value[10];
	char	lighttargets[MAX_SWITCHED_LIGHTS][64];


	// any light that is controlled (has a targetname)
	// must have a unique style number generated for it

	stylenum = 0;
	for (i=1 ; i<num_entities ; i++)
	{
		e = &entities[i];

		t = ValueForKey (e, "classname");
		if (Q_strncasecmp (t, "light", 5))
			continue;
		t = ValueForKey (e, "targetname");
		if (!t[0])
			continue;
		
		// find this targetname
		for (j=0 ; j<stylenum ; j++)
			if (!strcmp (lighttargets[j], t))
				break;
		if (j == stylenum)
		{
			if (stylenum == MAX_SWITCHED_LIGHTS)
				Error ("stylenum == MAX_SWITCHED_LIGHTS");
			strcpy (lighttargets[j], t);
			stylenum++;
		}
		sprintf (value, "%i", 32 + j);
		SetKeyValue (e, "style", value);
	}

}

//===========================================================

/*
============
EmitBrushes
============
*/
void EmitBrushes (void)
{
	int			i, j, bnum, s, x;
	dbrush_t	*db;
	mapbrush_t		*b;
	dbrushside_t	*cp;
	vec3_t		normal;
	vec_t		dist;
	int			planenum;

	numbrushsides = 0;
	numbrushes = nummapbrushes;

	for (bnum=0 ; bnum<nummapbrushes ; bnum++)
	{
		b = &mapbrushes[bnum];
		db = &dbrushes[bnum];

		db->contents = b->contents;
		db->firstside = numbrushsides;
		db->numsides = b->numsides;
		for (j=0 ; j<b->numsides ; j++)
		{
			if (numbrushsides == MAX_MAP_BRUSHSIDES)
				Error ("MAX_MAP_BRUSHSIDES");
			cp = &dbrushsides[numbrushsides];
			numbrushsides++;
			cp->planenum = b->original_sides[j].planenum;
			cp->texinfo = b->original_sides[j].texinfo;
		}

#ifdef ME
	//for collision detection, bounding boxes are axial :)
	//brushes are convex so just add dot or line touching planes on the sides of
	//the brush parallell to the axis planes
#endif
		// add any axis planes not contained in the brush to bevel off corners
		for (x=0 ; x<3 ; x++)
			for (s=-1 ; s<=1 ; s+=2)
			{
			// add the plane
				VectorCopy (vec3_origin, normal);
				normal[x] = s;
				if (s == -1)
					dist = -b->mins[x];
				else
					dist = b->maxs[x];
				planenum = FindFloatPlane (normal, dist);
				for (i=0 ; i<b->numsides ; i++)
					if (b->original_sides[i].planenum == planenum)
						break;
				if (i == b->numsides)
				{
					if (numbrushsides >= MAX_MAP_BRUSHSIDES)
						Error ("MAX_MAP_BRUSHSIDES");

					dbrushsides[numbrushsides].planenum = planenum;
					dbrushsides[numbrushsides].texinfo =
						dbrushsides[numbrushsides-1].texinfo;
					numbrushsides++;
					db->numsides++;
				}
			}

	}

}

//===========================================================

/*
==================
BeginBSPFile
==================
*/
void BeginBSPFile (void)
{
	// these values may actually be initialized
	// if the file existed when loaded, so clear them explicitly
	nummodels = 0;
	numfaces = 0;
	numnodes = 0;
	numbrushsides = 0;
	numvertexes = 0;
	numleaffaces = 0;
	numleafbrushes = 0;
	numsurfedges = 0;

	// edge 0 is not used, because 0 can't be negated
	numedges = 1;

	// leave vertex 0 as an error
	numvertexes = 1;

	// leave leaf 0 as an error
	numleafs = 1;
	dleafs[0].contents = CONTENTS_SOLID;
}


/*
============
EndBSPFile
============
*/
void EndBSPFile (void)
{
#if 0
	char	path[1024];
	int		len;
	byte	*buf;
#endif


	EmitBrushes ();
	EmitPlanes ();
	Q2_UnparseEntities ();

	// load the pop
#if 0
	sprintf (path, "%s/pics/pop.lmp", gamedir);
	len = LoadFile (path, &buf);
	memcpy (dpop, buf, sizeof(dpop));
	FreeMemory(buf);
#endif
}


/*
==================
BeginModel
==================
*/
int	firstmodleaf;
extern	int firstmodeledge;
extern	int	firstmodelface;
void BeginModel (void)
{
	dmodel_t	*mod;
	int			start, end;
	mapbrush_t	*b;
	int			j;
	entity_t	*e;
	vec3_t		mins, maxs;

	if (nummodels == MAX_MAP_MODELS)
		Error ("MAX_MAP_MODELS");
	mod = &dmodels[nummodels];

	mod->firstface = numfaces;

	firstmodleaf = numleafs;
	firstmodeledge = numedges;
	firstmodelface = numfaces;

	//
	// bound the brushes
	//
	e = &entities[entity_num];

	start = e->firstbrush;
	end = start + e->numbrushes;
	ClearBounds (mins, maxs);

	for (j=start ; j<end ; j++)
	{
		b = &mapbrushes[j];
		if (!b->numsides)
			continue;	// not a real brush (origin brush)
		AddPointToBounds (b->mins, mins, maxs);
		AddPointToBounds (b->maxs, mins, maxs);
	}

	VectorCopy (mins, mod->mins);
	VectorCopy (maxs, mod->maxs);
}


/*
==================
EndModel
==================
*/
void EndModel (void)
{
	dmodel_t	*mod;

	mod = &dmodels[nummodels];

	mod->numfaces = numfaces - mod->firstface;

	nummodels++;
}